diff --git a/paddle/fluid/framework/ir/preln_residual_bias_fuse_pass.cc b/paddle/fluid/framework/ir/preln_residual_bias_fuse_pass.cc
index 825f6960cf27d7c25a08c91e22f4fd328564f69e..43f48f87c09a513cb52088e7527cb3c2df13eb1a 100644
--- a/paddle/fluid/framework/ir/preln_residual_bias_fuse_pass.cc
+++ b/paddle/fluid/framework/ir/preln_residual_bias_fuse_pass.cc
@@ -61,7 +61,8 @@ void PrelnResidualBias::operator()(PDNode *x, PDNode *y) {
   auto *elementwise0 =
       pattern->NewNode(elementwise0_repr())->assert_is_op("elementwise_add");
   auto *elementwise_bias_var = pattern->NewNode(elementwise_bias_repr())
-                                   ->assert_is_op_input("elementwise_add", "Y");
+                                   ->assert_is_op_input("elementwise_add", "Y")
+                                   ->assert_is_persistable_var();
   auto *elementwise0_out_var = pattern->NewNode(elementwise0_out_repr())
                                    ->assert_is_op_output("elementwise_add")
                                    ->assert_is_op_input("elementwise_add")
diff --git a/paddle/fluid/inference/tensorrt/convert/preln_residual_bias.cc b/paddle/fluid/inference/tensorrt/convert/preln_residual_bias.cc
index abab96ea3b601cb089251fa46645779303cf727f..bdcb54cfe2e8e2b288402816376ced61855747a9 100644
--- a/paddle/fluid/inference/tensorrt/convert/preln_residual_bias.cc
+++ b/paddle/fluid/inference/tensorrt/convert/preln_residual_bias.cc
@@ -66,8 +66,8 @@ class PrelnResidualBiasOpConverter : public OpConverter {
     nvinfer1::ILayer* layer = nullptr;
     plugin::DynamicPluginTensorRT* plugin = nullptr;
     if (with_fp16) {
-      auto half_ele_bias_data = new half[bias_size];
-      for (int i = 0; i < bias_size; i++) {
+      auto half_ele_bias_data = new half[ele_bias_size];
+      for (int i = 0; i < ele_bias_size; i++) {
         half_ele_bias_data[i] = static_cast<half>(ele_bias[i]);
       }
       plugin = new plugin::PrelnResidualBiasPluginDynamic(bias,